Injector



Dec. 15, 1931. F. J. MARTY ET AL 1,836,262 l INJECTOR Filed Feb. 8, 1929 3 Sheets-Sheet l Dec. 15, 1931. F. J. MARTY ET Al. 1,836,262

INJECTOR Fled Feb. 8, 1929 5 Sheets-Sheet 2 id- M s DeC- 15|. 1.931- F. J. MARTY ET AL 1,836,262

INJECTOR Filed Feb. 8, 1929 5 Sheets-Sheet 3 Patented Dec. 15, 1931 UNIrso srArEs PATENT orales .i l

FRED' J. MARTY AND HOWARD D. YODER, OF DETROIT, MICHIGAN, ASSIGNORS TO IEENBERTHY INJECTOR COMPANY; OF DETROIT,y MICHIGAN, A

MICHIGAN INJEcTon .Application filed February 8, 1929. i Serial No. 338,350.

l@ tubes so that before mixture of steam and water has reached proper proportions the improperly mixed ,j et canV escape through the overflow valve and thence to the atmosphere.V

iWhen the steam and water have reached 15 proper proportionsV the jet overcomes the boiler pressure and rushesthrough the delivery jet tube without spillage thus creating j a vacuuminthe injector body and thus closting the overflow valve andreducing the re- 0 lief space to working range. l

The pressure in the delivery chamber set up `by the established jet actsto move .theV

sliding deliverytube intosuch position as to out down the large starting relief space to working range so that there is no discharge to the atmosphere and no spillage from the delivery tube after the jetl has been established due tohigh internal. pressure or high internal temperature.

rEhe provison of the large vstarting relief space may be accomplished in variousways; There are shown herein two'sucli ways of esfA tablishing 'a large starting `rellet space 1n 5 connection with single tube injectors. One

form consists ,in forming a plurality of spill holes in the sliding delivery 4tube andthe',` other consists in the utilization of a sliding Y delivery tube without any'spill holes whichl Vis moved into working position by the pressure in the delivery chamber. y l n The'spill holes in the delivery tube are required for automatic starting but are not eflicient as to maximum range of operation after the jet has been establishedV as internal pressure in the delivery tube, due to high steam pressure or high water temperature as thecase may be,"causes discharge of some water through the spill holes which eventually escapes through the overflow yso thatsuch escape will admit some air tothe combining chamber thereby affecting the vacuum estab-4v It is therefore de-v lished in this chamber. sirable to provide means for reducing the large starting area between the sliding de livery tube and the suction jet where a tube without spill holes is employed or shutting off escape from the spill holes after-the jet has been'established to allow operation of the injector through a wide range.`

An object of the invention is to provide an injector in which spillage is allowed for start ing ,and eliminated after the jet is estab` lished.

Another object oftheinvention is to pro-- vide an injector in which the elimination of spillage effect is accomplished by the action of the jet. v Y l A further obj ectof the invention is to provide van injecto-rwith a large starting space or area between the suction and delivery' tubes for starting purposes and reducing said` space or area after the jet is established by building up pressure in the delivery cham-` ber where ore the action of the jet itself serves to reduce such starting space.

A still further object of the invention is to provide an injector in which large spillage is providedfor starting purposes and which CORPORATION oF Y spillage is stopped after establishment of. the'I jet by building up pressure in the delivery chamber whereforethe action of thejet itself serves to reduce such starting space. l i

A yet further object of the invention is to provide an injector with a sliding delivery` tube and doubleacting valved relief for the combining and delivery chambers.

A yetfurther object of the invention is to provide an injector having a sliding deliv- `ery tube which requires no packing.

A still further object of the invention is to provide 'a single tube automatic injector .of

the automatic over flow type arranged to aul tomatically reestablish itself after interrupltio-n of water supply during its working cycle n which injector is economical to manufacture and eflicient in operation over a wide range.`

The above, other vand further objects of the invention will be apparent from the followiing description, accompanying drawings and appended claims.

This invention in one form is illustrated in the accompanying drawings and the views thereof are as follows:

Figure 1 is a vertical central section through an injector of the single tube type shown with double acting valves in the overflow chamber and embodying this invention.

Figure 2 is a section taken on line Il-II of Figure 1.

Figure 3 is a central vertical sectional view through an injector emboeying this invent-ion and showing a single valve for the overflow.

Figure i is a fragmental central sectional view through an injector showin a modified delivery tube in connection with a single overflow valve7 which type of delivery tube may be used in an injector having either a single overflow valve or the double overflow valve shown in the other figures.

Figure 5 is a central vertical section through an injector of the autopositive type showing a sliding delivery tube and arranged to embody the present invention.

r1`he injector illustrated in Figure 1 comprises a body casting 1 formed with partitions dening a water and steam chamber A, a combining chamber B, a delivery chamn ber C and an overflow chamber l). ing is provided also with a steam inlet 2, a water inlet 3,11v boiler discharge outlet l and an overflow outlet A steam jet 6 is threaded or otherwise arranged in the steam inlet 2 which jet pro-jects into the chamber A.

The partition 7 between the chambers A and B is centrally apertured and a suction jet 8 is threaded into the aperture through the partition 7 which jet is arranged to project each side of said partition and is provided with its receiving end 9 flared and larger iu diameter than the discharge end of the steam jet 6. The suction jet tube 8 has a. flange 10 about its outer surface to seat against the underside of the partition 7 and thus make the joint through the partition steam and watertight. j

A brass housing 11having cylindrical de. walls and a transverse end 12 is arranged iu the lower part of the body casting 1. rlf'he body casting 1 is provided near its lower end with a cylindrical wall 13 into the space defined by which wall extends the housing l1. T he `housing 11 has an end flange 1.4i which bears against the body 1 adjacent said opening 13. A washer 15 is interposed between the outer end of the housing 11 and a spider 16 Vwhich is retained against d washertrr hold the housing in position by a ap nutli' threaded at 18 into an opening in the lower end of the body casting 1. rlfhe upper wall 12 of the housing 11 is centrally apertured at 19 with thel upper portion of the aperture flared outwardly.

1 bushing or wall member 2O is secured on top'oi the housing 1 1 and is provided with The cast-V tain conditions.

an upper ring 21 for receiving the inner end of the suction jet tube 8.

A sliding delivering tube 22 is inovabfly arranged within the housing 11 and as shown in Figure 1 is in lowermost position. The upper end of the tube 22 when in the lowermost position is arranged to project a sli ghi'. distance beyond the top wall 12 of the housing 11 while the lower end of said tube extends downwardly below tlie washer 15 and into the delivery chamber C which is formed in the nut 17. The delivery tube 22 has a centrally bored portion the receiving end of which converges a slight distance forming the portion 23 then there is an intermediate substantially cylindrical portion with a di verging end portion Q5. The delivery tube 22 is provided as shown in Figure 1 with a plurality of spill holes 2G extending laterally through the wall of said tube to aflord communication between the i nterior and exterior of said tube. The lower end of the housing 11 provides a bearing for the lower end of the delivery tube Q2 (s the samey is moved in action as hereinafter more fully explained. The delivery tube 22 is provided also with an outwardly extending annular ring 2T near its upper end which ring serves a valve to seat against the underside of the opening 1f) through the upper wall 12 of the housing 11 when the delivery tube 22 is moved to its uppermost position to seal the opening 19.

The uppermost position ot' delivery tube 22 is shown in dotted lines in Figure 1.

The' delivery tube is provided with laterally disposed openings 2S near its upper end and Valso with axially formed ribs Q9 on the outside thereof extending upwardly from the valve 27 to the upper end of the ti be for the purpose of allowing the pt j water through the opening 19 in the housing 11 for escape through the overflow chamber hereinafter more fully explained.

The body casting 1 of the injector has a lateral portion 30 forming a part of the overflow chamber D and providing communication between delivery' chamber C and the overflow chamber D.. The wall 31 of the inj ector between the combining chamber B and the overflow 'chamber D is provided with a cylindrical opening 32. A valve having a cylindrical top is arranged to seat against said opening 32 and close the same under cer- The valve 33 is provided with axially extending guide wings 34 for controlling the movement of the valve in operation.

A threaded nipple 35 is threaded into said chamber 30 outwardly of the valve Said ipple. 35 has a central opening 36 therein iu axial alignment with the opening 32 in the wall 31 but of smaller diameter.

A valve 58 is arranged to seat against the outer surface of said nipple 35 and close the opening 36 therethroughunder certain con-- Lasagne ditions. This valve 58 has guidewings37 for guiding said valve in its movements. The outer surface ot the valve 58 is provided with a projection 38 for limiting outward' move# ment of said valve. A hollow cap member 39 is threaded in the end of the extension member 30 of the body casting 1; The extension 30 is formed with a passageway 40 communicating with the delivery 'chamber Cand` the interior of the cap member 39. Y

The overflow chamber D has an outlet 41 to which may be connected any kind ot waste pipe as desired. Y f

Suitable steam and water pipes are connected to the steam inlet 2, the waterV inlet 3 and to the boiler outlet 4 for communication with the boiler in a manner well understood; The injector shown in Figure 3 asgfar as the working parts thereof are concerned `is ei:- actly the same as that described with reference to Figure 1. except that instead of the double outlet valves'betwee'n the combining chamber B and the overlowchamber .Dl a single valve 42 is provided to; seat in'l valve seat 43 formed in one of the side walls of the body of the injector. The valve 42 'is carried by an arm 44 pivoted at 45'to the casting and arranged to have swinging movement about the pivot45. There is no communicating` passage between the delivery chamber Cand the overiow chamber Dot the `form of injector shown'inFigure 3. y

The arrangementshown in Figure 4 in-` cludes a housing 46 similar to housing 1 of Figure 1 in which is slidably mounted a delivery tube 47. vThe housing 46 is provided intermediate its length with annularvalve seat 48 against which a vring valve 49 on the delivery tube 47 engagesto sealcommunication'between the delivery chamber C and the combining chamber B Ywhen the tubev is in raised or fully operatingposition The valve 49 is arranged to seat against the underside ofI the valve seat 48 as said tube is raised.

The delivery tube shown in Figure-4 does vnot have any spill openings ot any kind en#` cept that near its upper end" it is provided with diainetrically opposite openings 50,51.

Thehousing 46 is securedy in the injectorV body casting by means of a nut 52 screwed into the lower end of said casting which nut has an inwardly extending skirt 53 provided with lateral openings 54theupper end of `which skirt bears against a guide bushing 55 which in turn rests against the underside or inner end of the housing 43. The bushing 55 may be provided with overflow ports 56 if desired.V

It will be observed that the sliding vdelivery tube of this invention is arranged to be sealed with respect to f the housing in which it slides in a manner to packing whatsoever. H

require no established again `through the steam jet 6 and passes through til such time as the jet is established.

A partial vacuum `is created in the combin-V ing chamber B by the velocity of the jet which aids in directing the incoming mixture of steam and water into the delivery tube 22 which is in the lowermost or full line position ot Figure 1. Somewater and steam Y will pass through the delivery tube 22 at high velocity kthe water more fully condensing the steam and reducing its volume. This j et then passes into the deliverycham- Vber C where until itis properly established for How into the boiler passes upwardly through the passage 40 against the outer valve 58 tending to close the saine. Such wateras does not enter the delivery tube will pass tothe overflow chamber D through the valve opening 32 and this state of aiiairs will continue until the jet is established. Establishment of the jet reduces the pressure in the combining'chainber B thus allowing valve 33 to :move towards its seat. e yitstablishment of the jet increases the `pressure in delivery chamber C which pressure is transmitted through the passageway 40 to the outer valve 58 and because of itsllarge area closes said valve so thatthepressure in the delivery chamber C is then built up to direct the jet into the boiler against the boiler pressure. Establishment of the jet as before stated reduces the pressure in the combining chamber B allowing valveV 33 to close. This condition remains aslong as the Y jet 'is Jfully established and as long as the water supply continues.

, Should for any reason' the water supply be discontinued lthen the pressure in deliveryl chamber C will fall, also the delivery tube 22 which in the meantimehas been raised by the pressure in the delivery chamber C to close valve 27 against its seat 19, therebyreestablishing the starting area orrspaceV be.

tween the suction jet tube 8 and the receiving end of the delivery tube 22. Thejetl is rein the manner before described. Y f Y The spill holes 26 inthe delivery tube 22 receive the `discharge through the same due to any internalpressurein the delivery tubev. where steam is employed or hightemperature"` The operationV offtliegiiijector shown inV` Figure 1 is.as'rfollowskjteam is admitted` when hot water is employed. The internal until the space within the housing` 11 between it and the delivery tube were filled whereuponthe spill holes 2G would be sealed by this pressure thus preventing the further escape of any water. Such arrangement permits the use of this injector with very high steam pressure or with very high temperature when hot water is employed.

The operation or the forms of the invention shown in Figures 3 and is similar to that described with respect to Figure l eX- cept that with reference to Figure 3 the pressure in the combining' chamber B will immediately open overflow valve 42 allowing 1 escape to the atmosphere of such overflow water until such time that the jet is established. Establishment or" the jet raises the delivery tube 22 to seal the valve 27 against its seat 1) thus placing' the delivery tube in communication with the suction jet 8. Such state of affairs creates a vacuum in the cornbining chamber B allowing' the valve 4Q to close.

Operation of the injector shown in Figure 4 is similar to that described with reference to Figure 3 except that there no spill holes in the delivery tube 47 that there of course would then be no escape from said tube due to internal pressure. The housine' 46 ot the form shown in Figure 4 is provided with openings 57 to Vallow passage between chambers C and B.

The iorm ot the injector shown in Figure comprises a casting` having` a. steam iulet GO. water inlet 6l, boiler connection 62 and overflow 63. The casting 5f) is Formed to provide a. steam chamber Fl. a water chamber F. a combining chamber G, a .delivery cham ier ll. and overflow chamber l.

A steam jet 64 is arranged in the ini ,ctor and communicates between the steam chainber E and the water chamber F. A suction jet (i5 is removably retained in the wall 65 of the injector between the water chamber F and the combining' chau'lher G', which jet projects into each of these chambers. A sliding` delivery tube G7 is supported within housing (38 secured in the injector casino; 59., and has limited sliding' movement axially in said housing. The doliverv tube 67 is provided with a collar 69 which is operable within a cb amber l formed in the housingn G8 bv a partition 70 and a Qui-dc bushing' '7l in the end of the housine'. The collar 69 on the delivery jet tube G7 seats ae'ainst the ring TO when the deli verv tube is forced outwardlv. that is.v into the full line position of Figure 5 b v the pressure in the deli very chainber H. Y

A wall .72 ot the overflow chamber l. is provided with an openingh 73 within which is axially movable a valve 74, the valve head of which seats against the outer end ot the opening and moves within the overflow 63.

rEhe valve is provided with a plurality of guide wings 75.

A nipple 76 communicates with the other wall of the overiiow outlet 63 and carries another valve 77 of the same character as valve 74, but with a smaller head. rlhis valve also is provided with guide wings 78. A hollow nut 7 9 is threaded into the injector casing' to provide a closure forming a chamber K outwardly of the valve 77. The cap 79 is provided with a stop 8O for limitingr the outward movement of the valve 77. The valves /l and 77 are so arranged that movement of one will cause the movement of the other in the same direction.

The injector casting' is provided .with a communicating opening 81 between the delivery chamber H and the chamber K.

The housing 68 is provided with lateral openings 82 and the `luide bushing 71 is provided with axial openings 83.

The operation of the injector of Figure 5 issimilar to that of Figure l except that there is not relative movement between the va ves 74 and 77 in the outlet chamber I.

The injector of Figure 5 is arranged to be horizontally disposed, that is, with the steam jet 64. the suction jet and the slidine; delivery tube 67 disposed on a horizontal anis rather than a vertical axis as shown in the other figures of the drawings.

lt will be observed that by this invention a very large starting space 0r area is pro vided between the suction jet 8 and the delivery tube. Such space is too large of course for ellicient operation of the injector after the jet is established. rllhe provision ot the sliding` ydelivery tube makes possible the rcduction of this space to operating ran ge wh en the jet has been established the tube being moved b v the jet itself when fully established. Furthermore. the provision of the sliding' jet tube seals the spill openings when the same are employed so as to prevent internal pressure within said tube from escapingr and passing' to the overflow which escape of course would open. the overli ow valves ad mitting air to the combining chamber thus reducing the vacuum therein and reducing; the rango through which the injector would be operatively ei'iicient.

The spill holes are desirable for the injector to reestablish the jet automatically starting the injector when the same has been stopped. but are undesirable for continuous operation ot the jet. The injector must have sutlicient relief space to automatically start so that before proper mixture of steam and water has been reached the improperly mixed jets can escape through thc overflow valve to the atmosphere.

The combination of the sliding delivery tube and the double acting valves as set forth in Figure l proves very efficient in automatic operation of an injector of the automatic e in response to pressure within the injector and movement of one wil'l affect movement of the other in the same direction.

The form of the invention illustrated showV the delivery tube as being slidable or movable. It is within the contemplation of thisv invention to make the delivery or combining tube in sections and slide or move all or some ot the sections to carry out the idea of the large relief space` forV starting which is auto` inatically reduced to working range.

This invention has been described rmore or less precisely herein yet it is to be understood that changesmaybe made'in the arrangement and proportion of parts and that equivalents may be substituted all without departing from the spirit and scope of the invention.

The invention is claimed as follows:

l. An injector having a sliding delivery tube, said tube having spill holes therein, a housing surrounding said tube with the inlet end of said tube projecting through said housing, and a valve on'said tube arranged to seal the space between said tube and said housing when said tube is moved by pressure created by the established jet.

2. An injector having a sliding delivery tube, said tube having spill holes therein, a housing surrounding that portion of the tube containing said holes and having an opening thereinthrough which extends the inlet end of said tube, `said tube being provided with passages lengthwise thereof for allowing spillage of water discharged through said holes outwardly of said housing, and a'ring on said tube arranged to seal said space and prevent spillage therethrough when said Y tube is raised by the pressure created by the established jet.

8. An injector of the automatic open overtlow type comprising` al suctionV tube and a sliding delivery tube, a housing surrounding said delivery tube, said housing having an opening through which the inlet end of said tube extends, a valve carried by said tube, said valve arranged to cooperate with said housing for preventing passage of ,water when said valve is in engagement with said housing, said delivery tube having a plurality oi' spill holes therein arranged to discharge within said housing, saidtube arranged on starting of the injector to lie with its valve out of engagement with said housing and on establishment of the jet to be moved with said valve in engagement with said housingV to seal escape therefrom, said tube being moved into sealing position by the pressure created by the established jet.

4. An injector having a suction tube, a sliding delivery tube movable towards and away' from said suction tube, a housing about said delivery tube and with respect to which said delivery tube slides, said housing having a spillage opening therein, said delivery tube having a valve portion for closingsaid spillage opening undercertain conditions, said delivery Vtube being positioned away from saidsuction tube for providing spillage space between said tube tor starting said injector and movable by the pressure created by the established jet for closing said spillage space between said tubes, and also for closing said spillage opening in said housing.

5. An injector having a suction tube, a sliding delivery tube movable towards `and away from said suction tube, a housing about said deliverytube, said delivery tube ar-` ranged for sliding movement with respect to said housing, said housing having a spillage opening therein, said delivery tubeliaving a valve portion for closing said spillage openl ing under certainV conditions, said delivery tube being positioned away from said suction tubeior providing spillage space between said tubes for starting said injector, an overflow valve opened by pressure of the water j spilled between said tubes, said injector havin a assafre between the deliver chamber and the overilow valve whereby pressure in said delivery chamber becomes effective to close said valve against said pressure as the jet is established, and said delivery tube being movable by the pressure created by the established jet for closing the spillage space between said tubes and also for closing the spillage opening in said housing.

In testimony whereof, we have hereunto subscribed our names at Detroit, Wayne County, Michigan.

FRED J MARTY. HOWARD D. YODER. 

